An unusual strain of swine flu has infected five young children in Maine, Pennsylvania and Indiana, health officials said Friday.

A boy of 7 or 8 from Cumberland County, Maine, became the latest case when he came down with flu symptoms in early October, not long after being exposed to pigs at an agricultural fair, the Maine Center for Disease Control and Prevention said. He and the other four children have recovered, health officials said.


The H3N2 swine-origin strain was confirmed by the U.S. Centers for Disease Control as the same strain identified earlier in three cases in Pennsylvania and one case in Indiana, according to Maine’s state epidemiologist Stephen Sears.


The three infected children in Pennsylvania had all attended an agricultural fair in August where pigs were exhibited, the CDC said. The Indiana child had not been exposed to pigs, but is thought to have been infected in late August by another person who had recently been exposed to pigs, but who did not have flu symptoms.


Unusual strains of influenza pop up virtually every year, health officials said, and there’s nothing to suggest that this H3N2 strain is being widely transmitted from person to person. The infected boy in Maine was treated by a family doctor and is back up and playing, Sears said.

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The H3N2 virus contains a gene picked up from H1N1 swine flu virus that resulted in global pandemic in 2009, the first combination virus to turn up in people since the pandemic, according to the CDC. It is a hybrid of viruses that have infected pigs over the last decade.


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